Generally, in a truss, compression members are thicker than tension members. Is this true or false?
Try it first: pick an option, then read the explanation.
Correct answer: A. True
Asked in SSC JE 27/01/2018 (Evening)
Detailed Explanation
Truss members carry axial force only, but tension and compression behave very differently.
Why “True” Is Correct
A tension member (tie) simply needs enough area to carry the stress; it cannot buckle. A compression member (strut) can buckle sideways long before the material is crushed, and its buckling strength depends on its slenderness (L/r). To reduce slenderness, struts are given larger, stiffer sections — so they are generally thicker. The statement is true.
Why the Other Options Are Wrong
- B. False: Struts must resist buckling, so they are made bigger.
- C. Can't say: The general rule is clear.
- D. Depends upon situation: As a general rule it is true.
Key Point
Struts (compression) are sized for buckling; ties (tension) only for strength.
Key Concepts for Students
- Euler buckling load P = π²EI/L_e².
- Slenderness ratio = effective length ÷ least radius of gyration.
- Ties can even be rods or cables.
Practice more: this is question 5 in Beams and Trusses MCQs – Part 1. Try the whole set and check every answer instantly.